A healthy, balanced diet is pretty much evenly split between carbs, protein and fat. Your body needs all three and any diet where you're cutting one or more of those big three out or down too significantly is really doomed to fail. If you're smart about WHERE you get those carbs from (whole wheat, brown rice/quinoa, etc.), you really don't need to cut them out.
If your goal is to lose weight, really just eat smaller portions throughout the day (I split my lunch in half and eat one half at noon and the other half at 2ish) and drink LOTS of water.